Corrugated pipe mechanical sealing structure with on-line leak detection structure and on-line leak detection system

Abstract

The utility model belongs to the field of pharmaceutical machinery, and particularly relates to a corrugated pipe mechanical sealing structure with an on-line leak detection structure and an on-line leak detection system. The static ring assembly is arranged outside the moving ring assembly in a sleeving manner, and a radial sealing structure is formed between the static ring assembly and the moving ring assembly; the axial sealing assembly is connected to one end of the shaft sleeve and comprises a corrugated pipe; the shaft sleeve is provided with a through first leakage detection channel, the outer end portion, close to the static ring assembly, of the first leakage detection channel is an annular groove, the static ring assembly is provided with a through second leakage detection channel, and the first leakage detection channel and the second leakage detection channel are communicated to form an online leakage detection channel. The radial sealing structure is arranged between the on-line leak detection channel and the axial sealing assembly. According to the utility model, the first leak detection channel is arranged on the shaft sleeve and the corresponding second leak detection channel is arranged on the static ring assembly, so that an on-line leak detection channel of which the air inlet is arranged on the static ring assembly is formed, and the on-line leak detection function is realized.

Description

Technical Field

[0001] This utility model belongs to the field of pharmaceutical machinery, specifically relating to a bellows mechanical seal structure with an online leak detection structure and an online leak detection system. Background Technology

[0002] Mechanical seal devices generally include a dynamic ring assembly connected to the stirring shaft and a stationary ring assembly connected to the container. The dynamic ring assembly and the stationary ring assembly work together to form a dynamic sealing effect.

[0003] In a three-in-one filter, wash, and dryer, the agitator shaft needs to not only rotate but also reciprocate up and down. This necessitates a bellows-type tube connected to the rotating ring assembly outside the shaft to achieve the necessary sealing for both rotational and reciprocating agitation. For example, the mechanical seal device for a reciprocating agitator shaft disclosed in patent CN201205043.X forms a breather chamber between the bellows and the shaft. During the reciprocating agitation process, the volume of this breather chamber dynamically changes. Therefore, a breather port needs to be provided on the rotating ring assembly of the mechanical seal device to allow the breather chamber to communicate with the outside. Since bellows are easily damaged, frequent leak checks are usually required to ensure they are undamaged. Current leak checks involve pressure testing the breather chamber through the breather port while the machine is stopped, which does not allow for online leak detection during operation and thus cannot guarantee production safety. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a bellows mechanical seal structure with an online leak detection structure and an online leak detection system.

[0005] The technical solution adopted by this utility model is as follows: A bellows mechanical seal structure with an online leak detection structure, comprising:

[0006] The rotating ring assembly includes a bushing and is equipped with a breather port;

[0007] The stationary ring assembly is fitted over the rotating ring assembly and forms a radial sealing structure between the two;

[0008] An axial sealing assembly, connected to one end of a bushing, includes a bellows;

[0009] The bushing is provided with a through first leak detection channel, which is divided into an annular groove near the outer end of the stationary ring assembly. The stationary ring assembly is provided with a through second leak detection channel. The first leak detection channel and the second leak detection channel are connected to form an online leak detection channel. The radial sealing structure is disposed between the online leak detection channel and the axial sealing assembly.

[0010] A set of seals is provided at the upper and lower ends of the online leak detection pipeline between the stationary ring assembly and the bushing.

[0011] The sealing element includes an inner ring and an outer ring. A groove is formed on the outer periphery of the inner ring. The outer ring is embedded in the groove outside the inner ring and the compression deformation exerts pressure on the inner ring, causing the inner ring to fit against the outer wall of the bushing.

[0012] The stationary ring assembly includes a second pressure cap, the second leak detection channel is a through hole provided through the second pressure cap, and a sealing groove is provided at the upper and lower ends of the inner circumference of the second pressure cap. The nested inner ring and outer ring are provided in the sealing groove, and a sealing pressure plate is fixedly connected to the upper and lower ends of the second pressure cap. The sealing pressure plate fixes the nested inner ring and outer ring.

[0013] The dynamic ring assembly includes a sliding bearing and a first pressure cover. The first pressure cover is fixedly connected to the upper end of the bushing by bolts and forms an upper limit on the sliding bearing. The vent is a through hole provided on the first pressure cover.

[0014] The moving ring assembly includes a moving ring, which is sleeved on the outer circumference of the bushing. The stationary ring assembly includes a lower stationary ring and an upper stationary ring, which are respectively disposed on the upper and lower sides of the moving ring to form a double-end radial sealing structure with the moving ring.

[0015] The stationary ring assembly includes a lower stationary ring seat, a cavity sleeve, an upper stationary ring seat, a bearing sleeve, and a rolling bearing. The lower stationary ring seat, cavity sleeve, upper stationary ring seat, bearing sleeve, and second pressure cap are connected sequentially from bottom to top. The lower stationary ring is disposed between the lower stationary ring seat and the moving ring, and the upper stationary ring is disposed between the upper stationary ring seat and the moving ring. The rolling bearing is disposed between the bearing sleeve and the bearing sleeve, and the second pressure cap provides an upper limit for the rolling bearing.

[0016] An online leak detection system for a filtration, washing, and drying equipment includes an agitator shaft and a container. A bellows mechanical seal structure with an online leak detection structure, as described above, is provided between the agitator shaft and the container. The system also includes an online leak detection pipeline connected to the inlet end of the online leak detection channel.

[0017] The online leak detection pipeline includes an air inlet pipeline and an air outlet pipeline connected to the inlet end of the online leak detection channel. The air inlet pipeline includes an air inlet control valve, a filter, a regulating valve, a pressure gauge, a testing instrument, and a check valve arranged sequentially along the air inlet direction. The air outlet pipeline is equipped with an air outlet control valve.

[0018] The test instrument is one or more of the following: pressure gauge, pressure transmitter, and flow transmitter.

[0019] The beneficial effects of this utility model are as follows: This utility model forms an online leak detection channel with the air inlet located on the static ring assembly by setting a first leak detection channel on the bushing and a corresponding second leak detection channel on the stationary ring assembly, thereby realizing the online leak detection function. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0021] Figure 1 This is a schematic diagram of the bellows mechanical seal structure with online leak detection in Example 1;

[0022] Figure 2 This is a schematic diagram of the mating structure of the dynamic ring assembly and the stationary ring assembly in Example 1;

[0023] Figure 3 for Figure 2 Enlarged diagram of part A in the middle;

[0024] Figure 4 This is a schematic diagram of the online leak detection system of the filtration, washing, and drying equipment in Example 2;

[0025] In the diagram, the components are: bushing-110, first leak detection channel-111, annular groove-112, moving ring-120, sliding bearing-130, first pressure cap-140, breather-141, lower stationary ring seat-210, cavity sleeve-220, upper stationary ring seat-230, bearing sleeve-240, second pressure cap-250, second leak detection channel-251, lower stationary ring-260, upper stationary ring-270, rolling bearing-280, inner ring-291, outer ring-292, sealing pressure plate-293, upper bellows connecting seat-310, bellows-320, lower bellows connecting seat-330, stirring shaft-400, air inlet control valve-510, filter-520, regulating valve-530, pressure gauge-540, pressure holding test instrument-550, one-way valve-560, and air outlet control valve-570. Detailed Implementation

[0026] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0027] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0028] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0029] Example 1:

[0030] This embodiment provides a bellows mechanical seal structure with an online leak detection mechanism, such as... Figure 1 , Figure 2 As shown, it includes a dynamic ring assembly, a stationary ring assembly, and an axial sealing assembly. The bellows mechanical seal structure is sleeved outside the stirring shaft 400 to form a radial seal and an axial seal between the stirring shaft 400 and the container, so as to prevent media leakage when the stirring shaft 400 performs circumferential rotation and up-and-down reciprocating motion.

[0031] Specifically, the structure of the dynamic ring assembly is as follows: Figure 2 As shown, the assembly includes a bushing 110, a rotating ring 120, a sliding bearing 130, and a first pressure cap 140. The rotating ring 120 is sleeved on the outer periphery of the bushing 110, and the sliding bearing 130 is disposed on the upper end of the bushing 110. The first pressure cap 140 is fixedly connected to the upper end of the bushing 110 by bolts and forms an upper limit on the sliding bearing 130, reducing the frictional resistance of the stirring shaft 400 reciprocating relative to the bushing 110. The first pressure cap 140 is provided with a through-hole vent 141.

[0032] The structure of the stationary ring assembly is as follows: Figure 2 As shown, the assembly includes a lower stationary ring seat 210, a cavity sleeve 220, an upper stationary ring seat 230, a bearing sleeve 240, a second pressure cap 250, a lower stationary ring 260, an upper stationary ring 270, and a rolling bearing 280. The lower stationary ring seat 210, cavity sleeve 220, upper stationary ring seat 230, bearing sleeve 240, and second pressure cap 250 are connected sequentially from bottom to top by long bolts and form a sealed cavity with the bushing 110. The lower stationary ring 260 is disposed between the lower stationary ring seat 210 and the rotating ring 120. The upper stationary ring 270 is disposed between the upper stationary ring seat 230 and the rotating ring 120. The rolling bearing 280 is disposed between the bearing sleeve 240 and the bearing sleeve 240, and the second pressure cap 250 forms an upper limit on the rolling bearing 280. The second pressure cap 250 and the bushing 110 are in a sealed fit.

[0033] The structure of the axial sealing assembly is as follows: Figure 1 As shown, the assembly includes a bellows upper connecting seat 310, a bellows 320, and a bellows lower connecting seat 330 connected in sequence. The upper end of the bellows upper connecting seat 310 is fixedly connected to the bushing 110, and the bellows lower connecting seat 330 is fixedly connected to the stirring shaft 400. The bellows 320 is telescopically sleeved over the stirring shaft 400, forming an axial seal for the reciprocating motion of the stirring shaft 400. The vent 141 communicates with the vent chamber formed between the bellows 320 and the stirring shaft 400 through the gap between the bushing 110 and the stirring shaft 400, and is used to maintain the internal pressure of the vent chamber when the bellows 320 expands and contracts.

[0034] Furthermore, the bushing 110 is provided with a through first leak detection channel 111, which is divided into an annular groove 112 near the outer end of the stationary ring assembly. The second pressure cap 250 is provided with a through second leak detection channel 251. The first leak detection channel 111 and the second leak detection channel 251 are connected to form an online leak detection channel. Pressure holding tests can be performed on the breathing chamber through the online leak detection channel. The inlet end of the online leak detection channel is located on the second pressure cap 250 of the stationary ring assembly and remains fixed during equipment operation, thus maintaining communication with the online leak detection pipeline to achieve online leak detection. The annular groove 112 ensures that the bushing 110 can be connected to the second leak detection channel 251 when the machine is stopped in any position.

[0035] Furthermore, a sealing structure is provided at both the upper and lower ends of the online leak detection pipeline between the second gland 250 and the bushing 110, such as... Figure 3 As shown, the sealing structure includes an inner ring 291 and an outer ring 292. The outer circumference of the inner ring 291 forms a groove, and the outer ring 292 is embedded in the groove outside the inner ring 291. The compression deformation exerts pressure on the inner ring 291, causing the inner ring 291 to fit against the outer wall of the bushing 110. Furthermore, the upper and lower ends of the inner circumference of the second pressure cover 250 are respectively provided with a sealing groove. The nested inner ring 291 and outer ring 292 are disposed in the sealing groove. The upper and lower ends of the second pressure cover 250 are respectively fixedly connected to sealing pressure plates 293 by bolts, which are used to fix the nested inner ring 291 and outer ring 292 for easy assembly.

[0036] Example 2:

[0037] This embodiment provides an online leak detection system for a filtration, washing, and drying equipment, including a stirring shaft 400 and a container. The stirring shaft 400 and the container adopt a bellows mechanical seal structure with an online leak detection structure as described in Embodiment 1. The system also includes an online leak detection pipeline, which includes an inlet pipeline and an outlet pipeline. The inlet pipeline includes an inlet control valve 510, a filter 520, a regulating valve 530, a pressure gauge 540, a pressure holding test instrument 550, and a one-way valve 560 arranged sequentially along the inlet direction. The outlet of the one-way valve 560 is connected to the inlet end of the online leak detection pipeline. The outlet pipeline is connected to the inlet end of the online leak detection pipeline and is equipped with an outlet control valve 570.

[0038] Under normal operating conditions, the breather 141 is open, and the inlet control valve 510 and outlet control valve 570 are closed. During online leak detection, a pressure holding test is performed. The breather 141 is closed, the inlet control valve 510 is open, and the outlet control valve 570 is closed. When a certain pressure is reached, the inlet control valve 510 is closed, and the pressure holding test instrument 550 is used to observe for leaks. After the test, the outlet control valve 570 is opened until the pipeline pressure returns to atmospheric pressure. Then, the outlet control valve 570 is closed, and the breather 141 is opened, thus completing the online leak detection process.

[0039] Among them, the pressure holding test instrument 550 can be a pressure gauge PI, which can display the pressure value in the pipeline in real time, making it easy to observe the pressure holding situation. It can also be a pressure transmitter PT or a flow transmitter FT, which converts the pressure or flow signal into a transmittable electrical signal or other signal for remote monitoring and data recording.

[0040] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A bellows mechanical seal structure with an online leak detection mechanism, comprising: The dynamic ring assembly includes a bushing (110) and a vent (141); The stationary ring assembly is fitted over the rotating ring assembly and forms a radial sealing structure between the two; An axial sealing assembly, connected to one end of a bushing (110), includes a bellows (320); The feature is that: the bushing (110) is provided with a through first leak detection channel (111), the first leak detection channel (111) is divided into an annular groove (112) near the outer end of the stationary ring assembly, the stationary ring assembly is provided with a through second leak detection channel (251), the first leak detection channel (111) and the second leak detection channel (251) are connected to form an online leak detection channel, and the radial sealing structure is disposed between the online leak detection channel and the axial sealing assembly.

2. The bellows mechanical seal structure with online leak detection structure according to claim 1, characterized in that: A set of seals is provided at the upper and lower ends of the online leak detection pipeline between the stationary ring assembly and the bushing (110).

3. The bellows mechanical seal structure with online leak detection structure according to claim 2, characterized in that: The seal includes an inner ring (291) and an outer ring (292). The outer circumference of the inner ring (291) forms a groove, and the outer ring (292) is embedded in the groove outside the inner ring (291). The compression deformation exerts pressure on the inner ring (291) so that the inner ring (291) fits against the outer wall of the bushing (110).

4. The bellows mechanical seal structure with online leak detection structure according to claim 3, characterized in that: The static ring assembly includes a second pressure cap (250), the second leak detection channel (251) is a through hole provided through the second pressure cap (250), and a sealing groove is provided at the upper and lower ends of the inner circumference of the second pressure cap (250). The nested inner ring (291) and outer ring (292) are provided in the sealing groove, and a sealing pressure plate (293) is fixedly connected to the upper and lower ends of the second pressure cap (250). The sealing pressure plate (293) fixes the nested inner ring (291) and outer ring (292).

5. The bellows mechanical seal structure with online leak detection structure according to claim 1, characterized in that: The moving ring assembly includes a sliding bearing (130) and a first pressure cover (140). The first pressure cover (140) is fixedly connected to the upper end of the bushing (110) by bolts and forms an upper limit on the sliding bearing (130). The breathing port (141) is a through hole provided on the first pressure cover (140).

6. The bellows mechanical seal structure with online leak detection structure according to claim 1, characterized in that: The moving ring assembly includes a moving ring (120), which is sleeved on the outer periphery of the bushing (110). The stationary ring assembly includes a lower stationary ring (260) and an upper stationary ring (270), which are respectively disposed on the upper and lower sides of the moving ring (120) to form a double-end radial sealing structure with the moving ring (120).

7. The bellows mechanical seal structure with online leak detection structure according to claim 6, characterized in that: The stationary ring assembly includes a lower stationary ring seat (210), a cavity sleeve (220), an upper stationary ring seat (230), a bearing sleeve (240), and a rolling bearing (280). The lower stationary ring seat (210), cavity sleeve (220), upper stationary ring seat (230), bearing sleeve (240), and second pressure cap (250) are connected sequentially from bottom to top. The lower stationary ring (260) is disposed between the lower stationary ring seat (210) and the moving ring (120). The upper stationary ring (270) is disposed between the upper stationary ring seat (230) and the moving ring (120). The rolling bearing (280) is disposed between the bearing sleeve (240) and the bearing sleeve (240), and the second pressure cap (250) forms an upper limit on the rolling bearing (280).

8. An online leak detection system for a filtration, washing, and drying equipment, comprising a stirring shaft (400) and a container, characterized in that: The stirring shaft (400) and the container are provided with a bellows mechanical seal structure with an online leak detection structure as described in any one of claims 1-7, and the bellows mechanical seal structure also includes an online leak detection pipeline connected to the inlet end of the online leak detection channel.

9. The online leak detection system for the filtration, washing, and drying equipment according to claim 8, characterized in that: The online leak detection pipeline includes an air inlet pipeline and an air outlet pipeline connected to the inlet end of the online leak detection channel. The air inlet pipeline includes an air inlet control valve (510), a filter (520), a regulating valve (530), a pressure gauge (540), a testing instrument (550), and a one-way valve (560) arranged sequentially along the air inlet direction. The air outlet pipeline is provided with an air outlet control valve (570).

10. The online leak detection system for the filter washing and drying equipment according to claim 9, characterized in that: The test instrument (550) is one or more of a pressure gauge, a pressure transmitter, and a flow transmitter.

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